Large-Scale installation Single-Line Electrical diagram

[Apellidos]

You are Right, ampers calculation is monophasic.

[SunEagle]

First of all, are three phase inverters as the diagram shows. It is call single line diagram because it shows all phases in one line. If you look at cabling you can see a 2 for DC and then three at AC for three phase.

Then, the person who is directly insulting me. I would ask him please why it would be enough with three inverters? The plant has to generate 1 MW and we are forced to use 20 kW inverters due to the location and maintanence issues. With three inverters the plant wouldn't produce enough power.

No the diagram does not show 3 phase inverters or a 3 phase 1000kva transformer because the amp values shown are for single phase.

Who ever made that drawing needs to go back to school and learn some basic electrical math.

[Apellidos]

First of all, are three phase inverters as the diagram shows. It is call single line diagram because it shows all phases in one line. If you look at cabling you can see a 2 for DC and then three at AC for three phase.

Then, the person who is directly insulting me. I would ask him please why it would be enough with three inverters? The plant has to generate 1 MW and we are forced to use 20 kW inverters due to the location and maintanence issues. With three inverters the plant wouldn't produce enough power.

[Sunking]

Is this a joke.

Tell you what, for $50K I will educate you. Consider it a Consultation fee. No one is going to answer your question, and it will never happen. No engineer is going to use consumer grade toy Inverters to build a commercial system. If you were my employee I would fire you on the spot for incompetence and write your school a nasty letter for letting an idiot graduate.

Here is a clue, it only takes 3-Inverters. Figure it out or hire someone who knows what they are doing. You are a joke. Please tell us who your boss is so we can direct his attention to this thread. You will be unemployed tomorrow. .

MOD's lock this thread so this idiot cannot delete his thread and hide.

[emartin00]

SunEagle is correct. That would definitely be a 3 phase system.
As for combining inverters, you will likely have custom built high voltage combiner cabinets.

[SunEagle]

I will make one comment and then let the experts chime in.

At that size system I would expect the inverters and main transformers to be 3 phase and not single phase as your single line represents.

Good luck on your project.

[Mike90250]

That's above my pay-grade, sorry.

[Apellidos]

Hi everyone,

I am a junior engineer in charge to design a 1MW solar PV plant for a feseability study. I found this forum and I hope some of you could give me a hand with a couple of enquiries I have.
Of course, my design will be assessed and improved by another experienced solar engineer. But I want to do my best and prove that I can be worthy for the company.

The installation is divided in 50 inverters of 20 kW each, 16 strings for each inverter and 8 modules for each string.
My main concern is how it is the connection of 50 inverters in a single transformer of 1250 kVA. Could you explain me that? I tried to find some scheme without success.

Additionaly, I am enclosing the electrical scheme because I am not sure about the required protections, consequently any comment or feedback would be highly appreciated.

Please, find attached the single-line electrical diagram.

Thanks,hopefuly some of you can help me and I also can contribute to the forum in a near future.